To rig its vehicles to cheat on u. S. Emissions tests. Volkswagens c. E. O. , who is an engineer, apologized today, but sorry didnt cut it with investors, v. W. s stock dove off a cliff, down more than 17 in the u. S. The company saw more than 14 billion go up in smoke in one trading session, and it now faces billions in fines. Kris van cleave is following this. Reporter the e. P. A. Alleges the german automaker designed a socalled defeat device to allow cars to pass emissions tests they should have failed. Certain diesel models were designed with Sophisticated Software that used information including the position of the Steering Wheel and speed of the vehicle to determine the car was undergoing emissions testing. The car was rigged to bypass that when being driven. Emissions increased 10 to 40 times above acceptable e. P. A. Levels. Professor dan carter was among the researchers at West Virginia university that first reported the difference in emillses last year. Once we started the test, it didnt take us long to realize emission levels for the two volkswagen vehicles were much higher than their certification levels. Reporter the carmaker ordered v. W. And audi dealers to immediately stop selling affected models of the beetle, golf, passat and a3. Volkswagen admitted guilt and offered an apology. I personally am deeply sorry we have broken the trust of the customers and the public. We will not and do not tolerate violations of any kind of our internal rules or the law. The e. P. A. Says cars are safe to continue driving until v. W. Fixes them. Scott, tonight at least two members of congress are pledging to hold hearings on this issue. Pelley kris, thank you. We have the list of v. W. And audi models involved on our web site, cbsnews. Com. Tomorrow pope francis begins his first visit to the United States. Hell arrive from cuba where he celebrated mass today for tens of thousands in holguin, the fourth largest city. Among those at the mass was the cuban dictator rauul castro. Allen pizzey has found the communist regime is beginning to remove the chains from the church house door. Reporter massive settings like havanas our lady of mercy is a rare experience for most of cubas catholic. The majority worship in makeshift churches like this one, no walls, no roof an altar brought in piecemeal, nonetheless, its a far cry from the early days of the communist revolution in 1959 when people could be arrested for worshipping. I think now this fear is disappearing, he said. For the first time in 50 years, work has even started on a new catholic church. It will be named after Pope John Paul ii, whose visit here in 1998 helped thaw relations between the church and fidel castro. American priest father Gilbert Walker lives in cuba and says francis is seen as a symbol of hope. Do you have any concerns that its all going to like fine while the pope is here, and then the pope goes away and thing go back to something that you might not like . I dont think that theres going to be sort of a facade during the popes visit. Well see. Reporter the church has found a nearby niche serving the poor, using soup kitchens like this one to help those the government can no longer support. The state still wont let the church open schools but provided the building for this Day Care Center run by sister Teresa Bernadette vaz. Just a few years ago this would have been unthinkable, she said. What will happen in the future, we dont know. What cubans do know is the old days are slipping away, even if not at pages many would like. The hope is that francis will continue to press their government to change in ways that only he can. Scott . Pelley allen pizzey traveling with the pope in cuba. Allen, thank you. President obama will personally welcome the pope when he lands at joint base andrews outside washington at about 4 00 p. M. Eastern time tomorrow. And cbs news will bring you live coverage right here. The pope will spend five days in washington, new york and philadelphia. Homeland security correspondent jeff pegues is looking into the challenge of protecting a man who puts his own safety in the hands of the lord. Reporter the coast guard is out in force in philadelphia. Theyre patrolling the delaware river, ready to restrict boat traffic during the popes visit. Captain Benjamin Cooper took us on patrol. We will have this area shut down. Well have coast guard vessels here. We will screen vessels. Well intercept them. Well escort them through once we determine they are safe. Reporter from the water to the streets, construction has been under way for about eight months. It is so detailed that the secret service developed this 3d virtual map of every location the pope will visit, and secret Service Agents have traveled to the vatican to study the popes movements says david beach, the secret Service Agent in charge of all security in the city. What was the goal there . This pope likes to get out and mingle. The vatican folks wanted us to see that and see how they were and to make sure we would be able to accommodate that within reason. And, you know, i believe we can. Reporter officials tell cbs news there is no credible threat against the pope, but they remained concerned about socalled lone wolf attacks as the pope traveling through philadelphia. Hell go straight by. Hell come around city hall and eventually end up back over here. Reporter mayor Michael Nutter says more than a Million People may come to see the pope during his three Outdoor Events in the city. How do you sleep comfortablely knowing weve accountedded for everybody thats come in . Good screen, good intelligence gathering and paying attention to whats going on. Reporter security will also be tight during the popes threeday visit to washington. Scott, he will deliver his first outdoor mass here at the National Basilica on wednesday in front of an expected crowd of about 25,000 people. Pelley an exciting time. Jeff pegues for us tonight. Jeff, thanks. This evening Wisconsin Governor Scott Walker dropped out of then nomination. Former Texas Governor rick perry left ten days ago. Walker was a rising star, but he barely registered in the polls after weak performances in the first two debates. Here was walker this evening. I will suspend my campaign immediately. I encourage other republican president ial candidates to consider doing the same so that the voters can focus on a limited number of candidates who can offer a positive, conservative alternative to the current frontrunner. Pelley after the second Republican Debate donald trump remains in front, but hes slipped eight points. Carly fiorina has jumped into second plates, up 12 points. Ben carson is down 5. Heres Major Garrett. Reporter for the first time donald trump sounded hesitant about his path to the nomination. I dont think panic is a word that i use, but, you know, sure, id like the stay on top. Im going to do whats right. If i dont make it, thats okay. Ill go back to having a good time and building a business. Reporter trumps caution is consistent with what he told us in early august. The only thing that can drive me out if my numbers drop down. Im a realist. Reporter retireder is John Ben Carson is embroiled in the kind of controversy usually reserved for trump for saying this about the possibility of a muslim president. I would not advocate that we put a muslim in charge of this nation. I absolutely would not agree with that. Reporter the u. S. Constitution says no religious test shall ever be required as a qualification to any office. But car isnts comments could appeal to part of the republican electorate, according to a gallup poll earlier this year, just 45 of republicans say they would support a muslim g. O. P. Nominee. The topic arose after trump refused to correct a questioner last week when he falsely accused president obama, a christian, of being muslim and not an american. Thank you. Thats my pleasure. Reporter florida senator marco rubio, who jumped eight points in the cnn orc poll, urged republicans to turn the page. He was born in the United States. Hes a christian. Hes the president of the United States for next year and a half and were going to move on. Reporter rubios campaign picked up a top walker organizer in New Hampshire even before the wisconsin governor dropped out. Over the weekend Close Friends urged walker to ride out this tough spot, instead the governor stunned his most loyal financial backers and quit. Pelley Major Garrett in the washington newsroom this evening. Major, thank you. On the democratic side, Hillary Clinton remains the frontrunner, up five points in the past two weeks over Bernie Sanders and possible candidate joe biden. Will Vice President biden get in . Heres nancy cordes. Its not like i can rush it. Reporter enter an interview with the catholic magazine america, Vice President biden said hes still deliberating and knows time is running out. Were just not, you know, its not quite there yet, and it may not get there in time to make it feasible to be able to run and succeed because there are certain windows that will close. Reporter but his increasingly antsy supporters in the draft biden camp hes in. Others say his wife jill might not be in, prompting others to say, of course dr. Biden would be on board if her husband decides to run. I think everybody ought that give him space to decide whats best for his family. Reporter on face the nation on sunday, clinton said shes waiting to see what the Vice President does just like everyone else. This is such a personal decision, he has to figure it out. Reporter theyd be fighting over the same pool of voters. If biden does not jump in, nearly all his supporters would back clinton. At the end of the day, democrats like both of these people. Reporter democrats lover both of these people. They agree on almost every issue. But what democrats want more than anything is to protect the gains weve made, whether its affordable care, whether its economic progress and other things that the Obama Administration has done. Reporter so clinton is spending the next two days campaigning not to protect obama care but to expand it with new caps on drug bills. As for biden, scott, one Party Insider told me the only true deadline is the primary filing deadline in early states, and thats not until late november. Pelley nancy cordes, thank you very much, nancy. Today we saw more evidence of russias military buildup in support of assads dictatorship in syria. Satellite photos show russian fighter jets in Eastern Syria and david martin reports the russians have deployed dozens of jets and helicopters. There is concern that they may target rebels that the u. S. Supports on come in conflict with american planes that are bombing syria. The exodus from syrias civil war is behind the refugee crisis in europe, and today hungary posted ads in middle eastern newspapers warning refugees that they face prison if they enter illegally. Mark phillips reports more borders were shut today. I want to get to austria. Reporter this is what happens if youre late to the refugee bus. Am i a human or not . Now answer me now reporter the stragglers tried to get to western europe through slovenia have discovered its closed. Slovenia only agreed reluctantly, ad many harrowing scenes, to allow the thousands who had crushed up against its borders to pass through. And then only on the condition that they move straight on to austria, germany and points north. Now police have sealed off the frontier again and the migrant border camp is being dismantled. Another day, another fence, this one being put up by slovenia, closing a route the refugees have been using the past few days. The message, were full, enoughs enough, dont come. The refugees agree they dont want to be here either. Some were so desperate to get on to a train leaving cray shark they didnt wait for an invitation, breaking through police lines and scrambling through windows. Fights broke out. No fights reporter those who have been dealing with the crisis on the ground, like Francesco Rocca of the red cross, arent holding out much hope for a quick solution. This is something that must be solved. This week well gain another meeting. Were waiting. Every week there is a highlevel meeting. There is no response from that meeting. Nothing happens. Reporter nothing happens because the arithmetic doesnt add up. If you take the numbers of all the migrants that various European Countries have agreed to accept, thats that still doesnt account for the hundreds of thousands who are already in europe. And, scott, more are coming. Pelley Mark Phillips with the refugees tonight in croatia. History is made at the emmy awards, but why did it take so long . And the pope inspired her to give a neighbor a tremendous gift when the cbs evening news continues. Keep returning. My constipation feels like a pile of bricks. That keeps coming back. Linzess can help. 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I cant seem to get that knowhow. I cant seem to get over that line. Reporter using the words of harriet tubman, viola davis crossed a very big line in hollywood and made history. The only thing that separates women of color from anyone else is opportunity. Reporter this was a moment 67 years in the making. 67. Reporter what did you want people to take away from your speech . Women of color actress, we sit around and talk about it all the time. We want to get past that line. We want people to know weve been in the game for 20, 30, 40 years, and we want the same opportunities. Its not like theres been a plethora of leading actress roles and you just havent recognized our talent. There has been nothing. Reporter just 13 of female characters on television are african american. 78 are white. How to get away with murder. Reporter davis won the emmy for her role as Analise Keating on the show how to get away with murder. In one memorable scene last season, she removed her wig and stripped off her makeup. Why is this woman so important . I know women like analise who dont fit the mold but have a very colorful sex life, but i have not seen that on the screen. Reporter yet she thinks this could be a breakthrough year. You let me be me. Reporter fellow black actresses, uzo aduba and regina king also took home emmys. Its passing the baton that gets you to that finish line, but its just your leg of the race. Its not the whole race. Reporter and viola davis is rooting for those who are still running. Ben tray, cbs news, los angeles. Pelley one of the most familiar faces on television the past 60 years has died. His story is next. You tuck here. You tuck there. If youre a toe tucker. Because of toenail fungus, ask your doctor now about prescription kerydin. Used daily, kerydin drops may kill the fungus at the site of infection and get to the root of your toe tucking. 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